Group unused range suppression codes into single diagnostic

[amyreese]

Summary

If a range suppression has more than one unused code, ruff will produce a separate diagnostic for each unused code, rather than grouping them into a single diagnostic like will happen for unused noqa:

$ cat ~/scratch/ruff/foo.py
# ruff: disable[F401, F501]
print("hello")  # noqa: F401 F501

$ cargo run -p ruff -- check --no-cache --isolated --preview --select F,RUF100 ~/scratch/ruff/foo.py
RUF100 [*] Unused suppression (unused: `F401`)
 --> /Users/amethyst/scratch/ruff/foo.py:1:17
  |
1 | # ruff: disable[F401, F501]
  |                 ^^^^
2 | print("hello")  # noqa: F401 F501
  |
help: Remove unused suppression
  - # ruff: disable[F401, F501]
1 + # ruff: disable[F501]
2 | print("hello")  # noqa: F401 F501
3 |

RUF100 [*] Unused suppression (unused: `F501`)
 --> /Users/amethyst/scratch/ruff/foo.py:1:23
  |
1 | # ruff: disable[F401, F501]
  |                       ^^^^
2 | print("hello")  # noqa: F401 F501
  |
help: Remove unused suppression
  - # ruff: disable[F401, F501]
1 + # ruff: disable[F401]
2 | print("hello")  # noqa: F401 F501
3 |

RUF100 [*] Unused `noqa` directive (unused: `F401`, `F501`)
 --> /Users/amethyst/scratch/ruff/foo.py:2:17
  |
1 | # ruff: disable[F401, F501]
2 | print("hello")  # noqa: F401 F501
  |                 ^^^^^^^^^^^^^^^^^
  |
help: Remove unused `noqa` directive
1 | # ruff: disable[F401, F501]
  - print("hello")  # noqa: F401 F501
2 + print("hello")
3 |

Found 3 errors.
[*] 3 fixable with the `--fix` option.
> [1]

Version

No response

[amyreese]

Consider how ty does this:

ruff/crates/ty_python_semantic/src/suppression.rs

Lines 260 to 289 in adf468b

	// Is this the first code directly after the `[`?
	let includes_first_code = source[..suppression.range.start().to_usize()]
	.trim_end()
	.ends_with('[');
	let mut current = suppression;
	let mut unused_codes = Vec::new();
	// Group successive codes together into a single diagnostic,
	// or report the entire directive if all codes are unused.
	while let Some(next) = unused_iter.peek() {
	if let SuppressionTarget::Lint(next_lint) = next.target
	&& next.comment_range == current.comment_range
	&& source[TextRange::new(current.range.end(), next.range.start())]
	.chars()
	.all(|c| c.is_whitespace() || c == ',')
	{
	unused_codes.push(next_lint);
	current = *next;
	unused_iter.next();
	} else {
	break;
	}
	}
	// Is the last suppression code the last code before the closing `]`.
	let includes_last_code = source[current.range.end().to_usize()..]
	.trim_start()
	.starts_with(']');